MISSION BAY — A San Diego SeaWorld official said a beluga whale calf born at the park’s Wild Arctic attraction is ‘‘doing well’’ and bonding with a ‘‘surrogate’’ mother. Booker T. Crenshaw, a SeaWorld public relations worker, said in a press release that the birth occurred June 23. Officials, said the mother, Ruby, did not bond or show interest in the female calf following her birth. ‘‘It was so unusual,’’ stated Bill Winhall, assistant curator of mammals, in a written statement. ‘‘Almost all the time our animal moms show interest in their calves or pups.’’ Crenshaw said park trainers have been hand-raising the young cetacean. The calf, who has not been given a name, is being tube fed a ‘‘special’’ baby whale milk formula developed by her trainers and is quickly gaining weight. At birth, the calf weighed approximately 95 pounds. She now weighs 119. ‘‘We knew within a minute that we were going to have to care for the calf,’ said Winhall. ‘‘We’re ecstatic with how well she’s doing.’’ Crenshaw said Allua, another female beluga at the Wild Arctic, ‘‘who has previously exhibited maternal behavior,’’ was introduced to the calf recently. He said the two have quickly bonded, and the 26-year-old Allua is ‘‘not only providing important companionship, but it is aiding in the calf’s progress and development.’’ Crenshaw said trainers are working to put the unnamed calf on public display at Wild Arctic with the park’s other beluga whales.